HARNESSING POWER THROUGH ELECTROMAGNETIC INDUCTION UTILIZING PRINTED COILS

• US 20110057629A1
• Filed: 09/04/2009
• Published: 03/10/2011
• Est. Priority Date: 09/04/2009
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Rahul, Pareet, Lin, Gloria, Dasgupta, Saumitro, Nakajima, Taido, Rosenblatt, Michael, Germansderfer, Bruno
• Granted Patent: US 8,193,781 B2
• Time in Patent Office: Days
• US Class Current: 322/3
• CPC Class Codes: H02K 3/26 consisting of printed conductors
• CPC Class Codes: H02K 3/47 Air-gap windings, i.e. iron-free windings
• CPC Class Codes: H02K 35/02 with moving magnets and stationary coil systems
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor
• CPC Class Codes: Y10T 29/4913 Assembling to base an electrical component, e.g., capacitor, etc.
• CPC Class Codes: Y10T 29/49826 Assembling or joining

Abstract

Systems for harnessing power through electromagnetic induction utilizing printed coils are provided. A system can include one or more moveable magnets adjacent to printed coils on a circuit. For example, a system can include one or more magnets that are operative to move alongside a circuit board that includes printed coils. The one or more magnets may move, for example, when a user shakes the system or when the user walks or runs while holding the device. The movement of the one or more magnets may create an electromotive force (e.g., a voltage) across the printed coils, and this force may be used to generate electric power.

Claims

1. A system for harnessing power through electromagnetic induction, the system comprising:

a first circuit board comprising;

a plurality of layers comprising a first layer and a second layer adjacent to the first layer;

a plurality of printed coils comprising a first coil printed on the first layer and a second coil printed on the second layer; and

a first via between the first layer and the second layer, the first via operative to electrically couple the first coil with the second coil; and

at least one magnet adjacent to the first circuit board and operative to move alongside the plurality of printed coils to generate an electromotive force across the plurality of printed coils.

2. The system of claim 1, wherein:

the plurality of layers comprises a third layer adjacent to the second layer;

the plurality of printed coils comprises a third coil printed on the third layer; and

the first circuit board comprises a second via between the second layer and the third layer, the second via operative to electrically couple the second coil with the third coil.

3. The system of claim 2, wherein:

the first circuit board comprises a periphery; and

the second via is closer to the periphery than the first via.

4. The system of claim 2, wherein:

each of the plurality of printed coils comprises an inner turn and an outer turn;

the first via couples the inner turn of the first coil with the inner turn of the second coil; and

the second via couples the outer turn of the second coil with the outer turn of the third coil.

5. The system of claim 1, wherein the first circuit board further comprises a printed trace printed on the first layer and electrically coupling the first coil with circuitry operative to condition power harnessed by the system.

6. The system of claim 1, wherein the first circuit board further comprises a dielectric material covering the first coil.

7. The system of claim 1, further comprising an enclosure mounted to the first circuit board and operative to retain the magnet in close proximity to the first circuit board.

8. The system of claim 1, wherein the at least one magnet comprises a plurality of magnets coupled together.

9. The system of claim 1, further comprising ferrofluid covering at least a portion of at least one of the at least one magnets, wherein the ferrofluid is operative to lubricate the covered magnet when it moves alongside the plurality of printed coils.

10. The system of claim 1, further comprising:

a second circuit board comprising;

a plurality of layers comprising a third layer and a fourth layer adjacent to the third layer;

a plurality of printed coils comprising a third coil printed on the third layer and a fourth coil printed on the fourth layer; and

a second via between the third layer and the fourth layer, the second via operative to electrically couple the third coil with the fourth coil; and

a conductive path electrically coupling the second coil with the third coil.

11. The system of claim 1, wherein:

the first circuit board comprises;

a top side; and

a bottom side opposite the top side; and

the at least one magnet comprises;

a first portion adjacent to the top side of the first circuit board;

a second portion adjacent to the bottom side of the first circuit board; and

a third portion extending between the first portion and the second portion.

12. A system for harnessing power through electromagnetic induction, the system comprising:

a circuit board comprising;

a top side;

a bottom side opposite the top side;

a plurality of layers disposed between the top side and the bottom side and comprising a first layer and a second layer adjacent to the first layer;

a plurality of printed coils comprising a first coil printed on the first layer and a second coil printed on the second layer; and

a via between the first layer and the second layer, the via operative to electrically couple the first coil and the second coil;

a top magnet adjacent to the top side of the circuit board and operative to move alongside the plurality of printed coils; and

a bottom magnet adjacent to the bottom side of the circuit board and operative to move alongside the plurality of printed coils, wherein the top magnet and the bottom magnet are operative to generate an electromotive force by moving across the plurality of coils.

13. The system of claim 12, wherein:

the plurality of layers comprises a third layer adjacent to the second layer;

the plurality of printed coils comprises a third coil printed on the third layer; and

the first circuit board comprises a second via between the second layer and the third layer, the second via operative to electrically couple the second coil with the third coil.

14. The system of claim 12, wherein the top magnet is coupled with the bottom magnet.

15. The system of claim 12, further comprising:

a first enclosure mounted to the top side of the circuit board and operative to retain the top magnet in close proximity to the circuit board;

a second enclosure mounted to the bottom side of the circuit board and operative to retain the bottom magnet in close proximity to the circuit board.

16. The system of claim 12, further comprising a support structure coupled with the circuit board and comprising at least one slot operative to guide the top magnet and the bottom magnet when they move alongside the plurality of coils.

17. The system of claim 16, further comprising a bracket extending through one of the at least one slots and coupling the top magnet with the bottom magnet.

18. The system of claim 12, wherein the circuit board further comprises at least one slot operative to guide the top magnet and the bottom magnet when they move alongside the plurality of coils.

19. The system of claim 18, further comprising a bracket extending through one of the at least one slots and coupling the top magnet with the bottom magnet.

20. A method for manufacturing a system for harnessing power through electromagnetic induction, the method comprising:

manufacturing a circuit board comprising a plurality of layers, a plurality of coils printed on the plurality of layers, and at least one via coupling a first coil of the plurality of coils with a second coil of the plurality of coils; and

providing a first magnet adjacent to the circuit board, wherein the first magnet is operative to move alongside the plurality of coils and generate an electromotive force across the plurality of coils.

21. The method of claim 20, further comprising attaching an enclosure to the circuit board, the enclosure being operative to retain the first magnet in close proximity to the circuit board while allowing the first magnet to move alongside the plurality of coils.

22. The method of claim 20, wherein:

the circuit board comprises a top side and a bottom side;

providing the first magnet comprises providing the first magnet adjacent to the top side of the circuit board; and

the method further comprises providing a second magnet adjacent to the bottom side of the circuit board, wherein the second magnet is operative to move alongside the plurality of coils and generate an electromotive force across the plurality of coils.

23. The method of claim 22, further comprising coupling the first magnet with the second magnet.

24. The method of claim 20, further comprising applying ferrofluid to the first magnet, wherein the ferrofluid is operative to lubricate the first magnet when it moves alongside the plurality of coils.

25. The method of claim 20, further comprising machining a slot in the circuit board, wherein the slot is operative to guide the first magnet when it moves alongside the plurality of coils.

26. The method of claim 20, further comprising attaching the circuit board to a support structure that comprises a slot operative to guide the first magnet when it moves alongside the plurality of coils.